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Fix some media attachments being converted with too high framerates (#17619)

Video files with variable framerates are converted to constant framerate videos
and the output framerate picked by ffmpeg is based on the original file's
container framerate (which can be different from the average framerate).

This means that an input video with variable framerate with about 30 frames per
second on average, but a maximum of 120 fps will be converted to a constant 120
fps file, which won't be processed by other Mastodon servers.

This commit changes it so that input files with VFR and a maximum framerate
above the framerate threshold are converted to VFR files with the maximum frame
rate enforced.
This commit is contained in:
Claire 2022-02-22 17:11:22 +01:00 committed by GitHub
parent 51e67f3243
commit 166f6e4b50
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 24 additions and 8 deletions

View File

@ -2,7 +2,7 @@
class VideoMetadataExtractor
attr_reader :duration, :bitrate, :video_codec, :audio_codec,
:colorspace, :width, :height, :frame_rate
:colorspace, :width, :height, :frame_rate, :r_frame_rate
def initialize(path)
@path = path
@ -42,6 +42,7 @@ class VideoMetadataExtractor
@width = video_stream[:width]
@height = video_stream[:height]
@frame_rate = video_stream[:avg_frame_rate] == '0/0' ? nil : Rational(video_stream[:avg_frame_rate])
@r_frame_rate = video_stream[:r_frame_rate] == '0/0' ? nil : Rational(video_stream[:r_frame_rate])
end
if (audio_stream = audio_streams.first)

View File

@ -38,6 +38,12 @@ class MediaAttachment < ApplicationRecord
MAX_DESCRIPTION_LENGTH = 1_500
IMAGE_LIMIT = 10.megabytes
VIDEO_LIMIT = 40.megabytes
MAX_VIDEO_MATRIX_LIMIT = 2_304_000 # 1920x1200px
MAX_VIDEO_FRAME_RATE = 60
IMAGE_FILE_EXTENSIONS = %w(.jpg .jpeg .png .gif).freeze
VIDEO_FILE_EXTENSIONS = %w(.webm .mp4 .m4v .mov).freeze
AUDIO_FILE_EXTENSIONS = %w(.ogg .oga .mp3 .wav .flac .opus .aac .m4a .3gp .wma).freeze
@ -75,6 +81,7 @@ class MediaAttachment < ApplicationRecord
VIDEO_FORMAT = {
format: 'mp4',
content_type: 'video/mp4',
vfr_frame_rate_threshold: MAX_VIDEO_FRAME_RATE,
convert_options: {
output: {
'loglevel' => 'fatal',
@ -152,12 +159,6 @@ class MediaAttachment < ApplicationRecord
all: '-quality 90 -strip +set modify-date +set create-date',
}.freeze
IMAGE_LIMIT = 10.megabytes
VIDEO_LIMIT = 40.megabytes
MAX_VIDEO_MATRIX_LIMIT = 2_304_000 # 1920x1200px
MAX_VIDEO_FRAME_RATE = 60
belongs_to :account, inverse_of: :media_attachments, optional: true
belongs_to :status, inverse_of: :media_attachments, optional: true
belongs_to :scheduled_status, inverse_of: :media_attachments, optional: true

View File

@ -13,6 +13,7 @@ module Paperclip
@time = options[:time] || 3
@passthrough_options = options[:passthrough_options]
@convert_options = options[:convert_options].dup
@vfr_threshold = options[:vfr_frame_rate_threshold]
end
def make
@ -41,6 +42,11 @@ module Paperclip
when 'mp4'
@output_options['acodec'] = 'aac'
@output_options['strict'] = 'experimental'
if high_vfr?(metadata) && !eligible_to_passthrough?(metadata)
@output_options['vsync'] = 'vfr'
@output_options['r'] = @vfr_threshold
end
end
command_arguments, interpolations = prepare_command(destination)
@ -88,13 +94,21 @@ module Paperclip
end
def update_options_from_metadata(metadata)
return unless @passthrough_options && @passthrough_options[:video_codecs].include?(metadata.video_codec) && @passthrough_options[:audio_codecs].include?(metadata.audio_codec) && @passthrough_options[:colorspaces].include?(metadata.colorspace)
return unless eligible_to_passthrough?(metadata)
@format = @passthrough_options[:options][:format] || @format
@time = @passthrough_options[:options][:time] || @time
@convert_options = @passthrough_options[:options][:convert_options].dup
end
def high_vfr?(metadata)
@vfr_threshold && metadata.r_frame_rate && metadata.r_frame_rate > @vfr_threshold
end
def eligible_to_passthrough?(metadata)
@passthrough_options && @passthrough_options[:video_codecs].include?(metadata.video_codec) && @passthrough_options[:audio_codecs].include?(metadata.audio_codec) && @passthrough_options[:colorspaces].include?(metadata.colorspace)
end
def update_attachment_type(metadata)
@attachment.instance.type = MediaAttachment.types[:gifv] unless metadata.audio_codec
end